JP2016082517A - Radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio device capable of switching a beam width of at least one of transmission and reception according to a state of communication.SOLUTION: A radio device comprises: an antenna beam width determination part (62) which determines a beam width of an antenna 5 corresponding to reception quality that a reception quality monitor part (61) measures; and an antenna control indication part (63) which sets a beam width of the antenna to the beam width that the antenna beam width determination part determines.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radio apparatus capable of switching a beam width.

  In order to implement high-quality wireless communication, a technique for selecting a beam pattern with good reception quality at high speed has been developed. For example, Patent Literature 1 discloses a wireless communication apparatus and a wireless communication system that can select a beam pattern with high accuracy at high speed.

JP 2013-179423 A (published September 9, 2013)

  However, since the conventional technology as described above uses a narrow beam pattern, the allowable range of deviation in an area where communication is possible is narrow. For this reason, when the position of the wireless communication device that performs communication is shifted, there is a problem that the position of the wireless communication device is likely to be out of the communication area.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a radio apparatus capable of switching a beam width in at least one of transmission and reception according to a communication state.

  In order to solve the above problems, a radio apparatus according to an aspect of the present invention includes a reception quality measurement unit that measures reception quality of a signal received by an antenna having a variable beam width, and the reception quality measurement unit. An antenna beam width determining unit that determines the beam width of the antenna corresponding to the measured reception quality; and an antenna control unit that sets the beam width of the antenna to the beam width determined by the antenna beam width determining unit. I have.

  In addition, a wireless device according to an aspect of the present invention includes a reception quality measurement unit that measures reception quality of a signal that is transmitted from a communication device that is a signal transmission source and is received by an antenna, and the reception quality measurement unit. An antenna beam width determining unit that determines a beam width of an antenna of a communication apparatus that is a transmission source of the signal corresponding to the reception quality measured by the information, and information indicating the beam width determined by the antenna beam width determining unit A notification unit that notifies a communication device that is a signal transmission source.

  In addition, a wireless device according to one embodiment of the present invention shows a reception quality measurement unit that measures reception quality of a signal transmitted from a communication device that is a signal transmission source and received by an antenna, and the reception quality A notification unit that notifies information to a communication device that is a transmission source of the signal.

  In addition, a wireless device according to one embodiment of the present invention is a wireless device including an antenna having a variable beam width, and receives information indicating the beam width of the antenna determined in a communication device that is a communication partner. And an antenna control unit which uses the received beam width of the antenna as the beam width of the antenna of its own apparatus.

  A wireless device according to one embodiment of the present invention is a wireless device including an antenna with a variable beam width, and receives information indicating the reception quality of a transmitted signal from a communication device that is a communication partner. An antenna beam width determination unit that determines the beam width of the antenna corresponding to the reception quality, and an antenna control unit that sets the beam width beam width of the antenna to the beam width determined by the antenna beam width determination unit And.

  According to one embodiment of the present invention, the antenna beam width can be switched according to the communication state.

1 is a block diagram illustrating a main configuration of a communication system according to Embodiment 1. FIG. 3 is a diagram illustrating an example of a signal frame structure according to Embodiment 1. FIG. (A)-(d) is a figure which shows the relationship between the state of each antenna element with which an antenna is provided, and the beam width of an antenna. (A) is a figure which shows an example of the beam width control table of Embodiment 1. FIG. (B) is a figure which shows an example of the reception quality set to the beam width control table. (C) is a figure which shows the principal part structure of the antenna which concerns on Embodiment 1. FIG. 3 is a flowchart illustrating a data processing flow of the wireless device according to the first embodiment. FIG. 3 is a block diagram illustrating a main configuration of a communication system according to Embodiments 2 and 3. 6 is a flowchart illustrating a data processing flow of the communication system according to the second and third embodiments.

Embodiment 1
The present embodiment will be described below with reference to FIGS. A communication system 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a main configuration of the communication system 1. The communication system 1 includes a wireless device 2 and a wireless device 3. The wireless device 2 and the wireless device 3 are a communication terminal (wireless LAN terminal), an access point, and the like. Note that the communication terminal and the access point can be either the wireless device 2 or the wireless device 3. Signals are transmitted and received between the wireless device 2 and the wireless device 3.

  The wireless device 2 will be described. The wireless device 2 includes an antenna 20. The wireless device 2 transmits and receives signals to and from the wireless device 3 via the antenna 20.

  Next, the wireless device 3 will be described. As shown in FIG. 1, the wireless device 3 includes a communication unit 4, an antenna 5, a control unit 6, and a storage unit 7.

  The communication unit 4 performs wireless communication with an external device (communication device) via the antenna 5. The wireless device 3 performs wireless communication with the wireless device 2.

  The communication unit 4 includes a reception unit 42 and a transmission unit 41. The receiving unit 42 receives a signal from the wireless device 2. Specifically, when receiving a signal including a quality monitoring pattern for monitoring reception quality from the wireless device 2, the reception unit 42 transmits the signal to the reception quality monitoring unit 61 of the control unit 6. The transmission unit 41 transmits a signal to the wireless device 2.

  Here, a frame structure of a signal received from the wireless device 2 will be described with reference to FIG. FIG. 2 shows an example of a frame structure of a signal transmitted from the wireless device 2 to the wireless device 3. The communication according to the present embodiment is assumed to be performed by a time division multiple access method (TDMA), but is not limited thereto. As shown in FIG. 2, a frame of a signal transmitted by the wireless device 2 is composed of a plurality of slots serving as a basic unit when performing time division multiple access. The frame is composed of at least three slots. The first slot is a beacon that transmits a synchronization signal serving as a time reference between the wireless device on the transmission side and the wireless device on the reception side. The second slot is a quality monitoring pattern for the wireless device 3 to monitor the reception quality. The third slot is a communication slot (Communication Slot (CS)) used for communication. In the present embodiment, for example, the signal is transmitted by the wireless device 2 every 100 msec.

  The antenna 5 is a directional antenna having directivity in the transmission / reception area. The detailed structure of the antenna 5 will be described later.

  Next, the beam width formed by the antenna 5 will be described with reference to FIG. FIG. 3 is a diagram illustrating the relationship between the on / off state of each antenna element 51 provided in the antenna 5 and the beam shape of the antenna 5. As shown in FIG. 3, the antenna 5 includes a plurality of antenna elements 51 arranged in a lattice pattern. Signals are transmitted to or received from the wireless device 2 in the transmission / reception area formed by the antenna element 51.

  The shapes of the transmission beam width (beam radiation direction) and the reception beam width (beam reception direction) of the signal of the antenna 5 will be described with reference to FIG. In FIG. 3, the black-colored antenna element 51 indicates the fed antenna element 51, and indicates the antenna element 51 in the on state. A white-painted antenna element 51 indicates an antenna element 51 that is not supplied with power, and indicates an antenna element 51 in an off state.

  FIG. 3A is a diagram showing the relationship between the on / off state of each antenna element 51 of the antenna 5 and the molding of the pencil beam. As shown in FIG. 3A, the antenna 5 includes a plurality of antenna elements 51 arranged in a lattice pattern. When all of the antenna elements 51 included in the antenna 5 are on, the antenna 5 forms a pencil beam F1 having a high directivity and a narrow beam width. The pencil beam has a narrower beam width than the fan beam described later.

  FIGS. 3B and 3C are diagrams showing the relationship between the on / off state of each antenna element 51 of the antenna 5 and the fan beam shaping. As shown in FIG. 3 (b), when the antenna elements 51 of the antenna 5 are limited to the antenna elements 51a in the central horizontal row (one row in the horizontal direction), the antenna 5 Forms a fan beam F2 having a high and low angle. Further, as shown in FIG. 3C, when the antenna elements 51 included in the antenna 5 are limited to the antenna elements 51 b in the central vertical row (one row in the vertical direction), The antenna 5 forms a fan beam F3 having a wide azimuth angle.

  In this embodiment, the horizontal direction and the vertical direction are exemplified as the arrangement direction of the antenna elements in the on state, but the present invention is not limited to this.

  FIG. 3D is a diagram showing the relationship between the on / off state of each antenna element 51 of the antenna 5 and other fan beam shaping. As shown in FIG. 3D, among the antenna elements 51 provided in the antenna 5, the on-state antenna elements are limited to the antenna elements 51 in the central horizontal row (one row in the horizontal direction). Further, as shown in FIG. 3D, the antenna elements at both ends of the antenna elements in the central horizontal row are turned off. At this time, the on-state antenna element 51c forms a fan beam F4 having a wider angle (wider beam width) than the fan beam F2 shown in FIG. In this way, the beam width of the antenna 5 is variable.

  Note that the pencil beam referred to here has a narrow beam width with a beam scanning angle θ within 30 °, for example, as shown in FIG. Further, the pencil beam has a circular beam shape with a narrow cross section with respect to the radio wave radiation direction. On the other hand, the fan beam has a wide beam width in which the beam scanning angle is larger than 30 °, for example. In addition, the fan beam has a biased beam spread, and has a fan-like beam shape.

  The control unit 6 includes a reception quality monitor unit (reception quality measurement unit) 61, an antenna beam width determination unit 62, and an antenna control instruction unit (antenna control unit) 63.

  The reception quality monitor unit 61 measures the reception quality of the signal received from the reception unit 42. Specifically, the reception quality monitor unit 61 receives the received signal strength (RSSI), signal-to-noise ratio (SNR), signal-to-interference / noise ratio (SINR), bit error rate, frame error rate, packet error rate, etc. Measure. The reception quality monitor unit 61 transmits reception quality information indicating the measured reception quality to the antenna beam width determination unit 62.

  The antenna beam width determination unit 62 determines the beam width of the antenna according to the reception quality measured by the reception quality monitor unit 61. Specifically, the antenna beam width determining unit 62 uses the beam width control table 72 that is a table in which the reception quality measured by the reception quality monitoring unit 61 and the beam width of the antenna 5 are associated with each other. Determine the width. The antenna beam width determination unit 62 determines the direction (beam width) in which the beam of the antenna 5 is shaped. Then, the antenna element control information indicating “switching each antenna element 51 on and off”, “scanning angle of the shaped beam” and the like corresponding to the beam width indicated in the beam width control table 72 is indicated as an antenna control instruction. It transmits to the part 63.

  The beam width control table 72 will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of the configuration of the antenna 5 and the beam width control table 72 according to the present embodiment. FIG. 4A shows an example of the beam width control table 72. As shown in FIG. 4A, the beam width control table 72 associates the beam shaping direction (beam width, beam scanning angle) with the reception quality. Also, the beam width control table 72 associates switching of each antenna element 51 between ON and OFF and the above-mentioned “direction of beam shaping”. In FIG. 4A, the “X” in the column of “antenna element to be turned on” indicates that the corresponding antenna element is switched on, and the blank indicates that the corresponding antenna element is switched off. Moreover, in this embodiment, as shown in FIG.4 (c), the setting of the several antenna element 51 arrange | positioned on the straight line is illustrated. Details of the configuration of the antenna 5 will be described later.

  Next, the reception quality set in the beam width control table 72 will be described with reference to FIG. FIG. 4B shows an example of reception quality set in the beam width control table 72. As shown in FIG. 4B, for example, the case where the reception quality is RSSI and the numerical value width of RSSI is divided into four is shown. The reception quality increases from the reception quality R1 to the reception quality R4 shown in FIG. The method of dividing the numerical value range of the reception quality is not limited to this, and any number can be used. Also, the “beam shaping direction” associated with each reception quality can be arbitrarily set.

  The beam width control table 72 is set so that the beam width of the antenna 5 becomes wider as the reception quality becomes higher. Therefore, when the reception quality is lower than the previously measured value, the antenna beam width determination unit 62 determines to narrow the beam width. Further, when the reception quality is higher than the previously measured value, the beam width is determined to be widened.

  That is, the reception quality and the beam width of the antenna 5 are associated with each other so that the higher the reception quality, the wider the beam width of the antenna 5.

  Generally, when the reception quality is low, the distance between the wireless devices performing communication is long, and when the reception quality is high, the distance between the wireless devices performing communication is considered to be short. By narrowing the beam width, the signal transmission / reception distance can be increased. Therefore, by narrowing the beam width, the signal transmission / reception distance can be increased and the signal reception quality can be improved. In addition, when the reception quality is high, a predetermined level of reception quality is ensured. At this time, by increasing the beam width, it is possible to increase out-of-service tolerance due to a shift in the position (direction) of the wireless device.

  As the setting of the beam width control table 72, for example, when the reception quality is extremely low, the transmission / reception area of the antenna 5 may be a pencil beam shape. Further, as the reception quality becomes higher, the fan beam-shaped transmission / reception area may be set to expand appropriately.

  The antenna control instruction unit 63 sets (controls) the transmission / reception area of the antenna 5 to the beam width determined by the antenna beam width determination unit 62. Specifically, the antenna control instruction unit 63 sets the antenna beam width by switching each of the plurality of antenna elements on and off.

  That is, the antenna control instruction unit 63 sets the beam width to be narrowed when the reception quality is lower than the last measured value, and sets the beam width when the reception quality is higher than the last measured value. Set to widen. More specifically, the antenna control instruction unit 63 sets the beam width of the antenna by switching the antenna element 51 on and off according to the antenna element control information.

  Here, the detailed structure of the antenna 5 is demonstrated using (c) of FIG. FIG. 4C is a diagram illustrating a main configuration of the antenna 5. The antenna 5 includes a plurality of antenna elements 51, a phase shifter 52, a high frequency power feeding circuit 53, and a scanning control circuit 54.

  The antenna element 51 transmits and receives radio waves. The antenna elements 51 having a plurality of ports are arranged in a lattice (a plurality of lines) at a predetermined interval.

  The high frequency power supply circuit 53 supplies a high frequency signal to each of the antenna elements 51 having a plurality of ports.

  A plurality of phase shifters 52 are provided, and each phase shifter 52 is interposed in each feed line of the antenna element 51 having a plurality of ports. The phase shifter 52 gives the phase shift amount designated by the scanning control circuit 54 to the high frequency signal.

  The scanning control circuit 54 receives antenna element control information from the antenna control instruction unit 63 via the communication unit 4. The scanning control circuit 54 controls each phase shift amount of the phase shifter 52 in accordance with the scanning of the shaped beam (the scanning angle of the shaped beam and the direction in which the beam is shaped). Further, the scanning control circuit 54 controls power feeding from the power supply to each phase shifter 52 based on information on switching of each antenna element on and off. That is, by electrically turning off the phase shifter 52 corresponding to the antenna element 51 that is set to OFF, the high-frequency power supply to the antenna element 51 that is set to OFF is turned off.

  Next, a processing flow of the wireless device 3 according to the present embodiment will be described. FIG. 5 is a flowchart showing the data processing flow of the wireless device 3.

  As shown in FIG. 5, the receiving unit 42 of the wireless device 3 receives a signal from the wireless device 2 (S1). The reception quality monitor unit 61 measures the reception quality of the signal received by the reception unit 42 (S2). The antenna beam width determining unit 62 determines the beam width of the antenna corresponding to the reception quality measured by the reception quality monitoring unit 61 (S3). The antenna control instruction unit 63 sets the antenna 5 to the beam width of the antenna 5 determined by the antenna beam width determination unit 62 by switching each of the antenna elements 51 on and off (S4).

[Embodiment 2]
The following will describe another embodiment of the present invention with reference to FIG. 6A and FIG. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. In the communication system 1a according to the present embodiment, the description of the same configuration as that of the communication system 1 according to the first embodiment is omitted.

  A communication system 1a according to the present embodiment will be described with reference to FIG. (A) of FIG. 6 is a block diagram which shows the principal part structure of the communication system 1a. The communication system 1a includes a wireless device 2a and a wireless device 3a. The wireless device 2a and the wireless device 3a are a communication terminal (wireless LAN terminal), an access point, and the like. The communication terminal and the access point can be either the wireless device 2a or the wireless device 3a. Signals are transmitted and received between the wireless device 2a and the wireless device 3a.

  The wireless device 2a will be described. As shown in FIG. 6A, the wireless device 2a includes a communication unit 14, an antenna 20, and an antenna control unit 17.

  The communication unit 14 performs wireless communication with an external device (communication device) via the antenna 20. The wireless device 2a performs wireless communication with the wireless device 3a. The communication unit 14 includes a reception unit 15 and a transmission unit 16.

  The receiving unit 15 receives beam width information indicating the beam width from the radio apparatus 3 a and transmits the information to the antenna control unit 17.

  The transmission unit 16 transmits a signal to the wireless device 3a.

  Since the antenna 20 has the same configuration as the antenna 5 described in the first embodiment, description thereof is omitted here.

  The antenna control unit 17 sets the beam width of the antenna 20 of its own device to the beam width indicated by the beam width information received from the wireless device 3a.

  Next, the wireless device 3a will be described. Here, only the configuration of the wireless device 3a that is different from the wireless device 3 of the first embodiment will be described. The control unit 6a included in the wireless device 3a includes an antenna beam width determination unit (notification unit) 62a instead of the antenna beam width determination unit 62 described in the first embodiment, and includes a storage unit 7 and a beam width control table 72. Are provided with a storage unit 18 and a beam width control table 19.

  The beam width control table 19 is the same table as the beam width control table 72. That is, in the beam width control table 19, the reception quality and the beam width of the antenna 20 are associated so that the higher the reception quality, the wider the beam width of the antenna 20 of the radio apparatus 2a. The antenna beam width determination unit 62a refers to the beam width control table 19 to determine the beam width of the antenna of the wireless device 2a that is the signal transmission source, and transmits beam width information indicating the beam width to the transmission unit 41a. To the wireless device 2a.

  Next, a processing flow of the communication system 1a according to the present embodiment will be described. (A) of FIG. 7 is a flowchart which shows the flow of a process of the communication system 1a. Since S1 to S2 have been described in the first embodiment, description thereof is omitted here. As shown in FIG. 7A, the antenna beam width determination unit 62a determines the beam width of the antenna 20 corresponding to the reception quality measured by the reception quality monitor unit 61 using the beam width control table 19 ( Along with S3a), beam width information indicating the determined beam width is notified to the radio apparatus 2a of the communication apparatus that is the signal transmission source (S4a). The wireless device 2a sets the beam width of the antenna 20 of its own device to the notified beam width (S6a).

[Embodiment 3]
Another embodiment of the present invention will be described below with reference to FIGS. 6B and 7. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. In the communication system according to the present embodiment, the description of the same configuration as that of the communication system 1a of the second embodiment is omitted.

  A communication system 1b according to this embodiment will be described with reference to FIG. FIG. 6B is a block diagram showing a main configuration of the communication system 1b. The communication system 1b includes a wireless device 2b and a wireless device 3b. The wireless device 2b and the wireless device 3b are communication terminals (wireless LAN terminals), access points, and the like. The communication terminal and the access point can be either the wireless device 2b or the wireless device 3b. Signals are transmitted and received between the wireless device 2b and the wireless device 3b.

  Regarding the wireless device 2b according to the present embodiment, a configuration different from the wireless device 2a of the second embodiment will be described. As illustrated in FIG. 6B, the wireless device 2b includes a communication unit 14, an antenna 20, and an antenna control unit 17b. Further, in the present embodiment, the storage unit 18 and the beam width control table 19 are provided not in the wireless device 3b but in the wireless device 2b. Also in this embodiment, in the beam width control table 19, the reception quality and the beam width of the antenna 20 are associated with each other so that the beam width of the antenna 20 becomes wider as the reception quality becomes higher.

  The receiving unit 15 included in the communication unit 14 receives information indicating the reception quality of the received signal measured by the wireless device 3b from the wireless device 3b, and transmits the information to the antenna control unit 17b.

  The antenna control unit 17b includes an antenna beam width determination unit 31b and an antenna control instruction unit 32b.

  The antenna beam width determination unit 31b determines the beam width of the antenna 20 corresponding to the reception quality indicated by the received information. Specifically, the antenna beam width determination unit 31b determines the beam width of the antenna 20 using the reception quality indicated by the received information and the beam width control table 19 in which the reception quality and the beam width of the antenna 20 are associated with each other. . In this embodiment as well, the beam width control table 19 is stored in the storage unit 18 and is the same table as the beam width control table 72.

  Since the data processing of the antenna beam width determination unit 31b is the same as that of the antenna beam width determination unit 62 of the first embodiment, description thereof is omitted here. The antenna beam width determination unit 31b transmits the antenna element control information to the antenna control instruction unit 32b.

  The antenna control instruction unit 32b functions in the same manner as the antenna control instruction unit 63 described in the first embodiment, and sets the beam width of the antenna 20 to the beam width determined by the antenna beam width determination unit 31b.

  Next, the wireless device 3b will be described. Here, only the configuration of the wireless device 3b that is different from the wireless device 3a of the second embodiment will be described. The control unit 6b included in the wireless device 3b includes a reception quality monitoring unit (notification unit) 61b instead of the reception quality monitoring unit 61 described in the second embodiment. The reception quality monitoring unit 61b transmits information indicating the reception quality of the measured reception signal to the wireless device 2b that is the transmission source of the signal via the transmission unit 41a.

  Next, a processing flow of the communication system 1b according to the present embodiment will be described. FIG. 7B is a flowchart showing a processing flow of the communication system 1a. Since S1 and S2 have been described in the first embodiment, description thereof is omitted here. As shown in FIG. 7B, the reception quality monitoring unit 61b notifies the wireless device 2b, which is the signal transmission source, of information indicating the measured reception quality of the received signal (S4b). The radio apparatus 2b determines the beam width of the antenna 20 corresponding to the received reception quality using the beam width control table 19 (S5). The antenna control instruction unit 32b controls the beam width of the antenna 20 to the beam width determined by the antenna beam width determination unit 31b (S6b).

[Example of software implementation]
The control blocks of the wireless devices 2a, 2b, 3, 3a and 3b may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or using a CPU (Central Processing Unit). It may be realized by software.

  In the latter case, the wireless devices 2a, 2b, 3, 3a, and 3b have a CPU that executes instructions of a program that is software that realizes each function, and the program and various data are recorded so as to be readable by a computer (or CPU). In addition, a ROM (Read Only Memory) or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A radio apparatus according to aspect 1 of the present invention includes a reception quality measurement unit (reception quality monitoring units 61 and 61b) that measures reception quality of a signal received by an antenna (5) having a variable beam width, and the reception quality. An antenna beam width determination unit (62, 62a) for determining the beam width of the antenna corresponding to the reception quality measured by the measurement unit, and the beam width of the antenna to the beam width determined by the antenna beam width determination unit. And an antenna control unit (63) for setting.

  According to said structure, an antenna control part switches the beam width of an antenna to the beam width of the antenna corresponding to the reception quality of the received signal. Therefore, the radio apparatus can switch the beam width in at least one of transmission and reception according to the communication state.

  A radio apparatus (3a) according to aspect 2 of the present invention includes a reception quality measurement unit that measures reception quality of a signal transmitted from a communication apparatus that is a signal transmission source and received by an antenna, and the reception quality measurement described above. An antenna beam width determining unit (antenna beam width determining unit 62a) that determines the beam width of the antenna of the communication device that is the transmission source of the signal corresponding to the reception quality measured by the unit, and the antenna beam width determining unit determines A notification unit (antenna beam width determination unit 62a) that notifies the communication device (radio device 2a) that is the transmission source of the signal may be provided.

  According to said structure, it can notify about the beam width which the antenna beam width determination part determined to the communication apparatus which is a signal transmission source. For example, the communication apparatus can switch the beam width of its own apparatus corresponding to the received beam width.

  The wireless device (3b) according to the third aspect of the present invention is a reception quality measurement unit (reception quality monitoring unit 61b) that measures the reception quality of a signal transmitted from a communication device that is a signal transmission source and received by an antenna. ) And a notification unit (reception quality monitoring unit 61b) for notifying information indicating the reception quality to the communication device (wireless device 2b) that is the transmission source of the signal.

  According to said structure, the information which shows the reception quality of the received signal can be notified to the communication apparatus which is a signal transmission origin. For example, the communication apparatus can switch the beam width of the own apparatus in accordance with the received reception quality.

  The wireless device (2a) according to aspect 4 of the present invention is a wireless device that is a communication partner of the wireless device (3a) according to aspect 2 of the present invention. The wireless device (2a) according to the fourth aspect of the present invention is a wireless device including an antenna (20) having a variable beam width, and the beam of the antenna determined in the communication device (wireless device 3a) as a communication partner. A receiving unit (15) that receives information indicating the width and an antenna control unit (17) that uses the received beam width of the antenna as the beam width of the antenna of the device itself.

  According to said structure, the beam width of the antenna of an own apparatus can be switched corresponding to the beam width of the antenna received from the communication apparatus which is a communicating party.

  The wireless device (2b) according to aspect 5 of the present invention is a wireless device that is a communication partner of the wireless device (3b) according to aspect 3 of the present invention. A wireless device (2b) according to aspect 5 of the present invention is a wireless device including an antenna (20) having a variable beam width, and information indicating reception quality of a transmitted signal is a communication device that is a communication partner. (Receiver (15) that receives from (wireless device 3b), antenna beam width determination unit that determines the beam width of the antenna corresponding to the reception quality, and the beam determined by the antenna beam width determination unit (31b) An antenna control unit (antenna control instruction unit 32b) that sets the beam width of the antenna to the width.

  According to said structure, the beam width of an own apparatus can be switched corresponding to the reception quality received from the communication apparatus which is a communicating party.

  In the wireless device (3, 3a, 2b) according to aspect 6 of the present invention, in the above aspect 1, 2, or 5, the higher the reception quality, the wider the beam width of the antenna (20, 5). The reception quality may be associated with the beam width of the antenna.

  According to the above configuration, when the reception quality is low, the beam width is narrowed. In transmission / reception of a wireless device having directivity in beam width, the distance of signal transmission / reception can be increased by narrowing the beam width. Therefore, by narrowing the beam width, the signal transmission / reception distance can be increased and the signal reception quality can be improved.

  Moreover, according to said structure, when reception quality becomes high, a beam width is expanded. That is, when the reception quality value becomes high, the out-of-service tolerance due to the shift of the position (direction) of the wireless device can be increased by widening the beam width.

  The wireless device according to each aspect of the present invention may be realized by a computer. In this case, the wireless device is controlled by the computer by causing the computer to operate as each unit included in the wireless device. A program and a computer-readable recording medium on which the program is recorded also fall within the scope of the present invention.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The present invention can be used for a radio apparatus and a communication system.

  1, 1a, 1b: communication system, 2, 2a, 2b, 3, 3a, 3b: wireless device (communication device), 5: antenna, 15: receiving unit, 17: antenna control unit, 31b: antenna beam width determining unit 32b: Antenna control instruction unit 51: Antenna element 61, 61b: Reception quality monitor unit (reception quality measurement unit, notification unit) 62, 62a: Antenna beam width determination unit (antenna beam width determination unit, notification unit) , 63: Antenna control instruction unit, 72: Beam width control table (table)

Claims (6)

A reception quality measurement unit for measuring reception quality of a signal received by an antenna having a variable beam width;
An antenna beam width determining unit for determining a beam width of the antenna corresponding to the reception quality measured by the reception quality measuring unit;
An antenna control unit configured to set a beam width of the antenna to the beam width determined by the antenna beam width determination unit. A reception quality measurement unit that measures the reception quality of a signal transmitted from a communication device that is a signal transmission source and received by an antenna;
An antenna beam width determining unit that determines a beam width of an antenna of a communication device that is a transmission source of the signal corresponding to the reception quality measured by the reception quality measuring unit;
A wireless device comprising: a notification unit that notifies information indicating the beam width determined by the antenna beam width determination unit to a communication device that is a transmission source of the signal. A reception quality measurement unit that measures the reception quality of a signal transmitted from a communication device that is a signal transmission source and received by an antenna;
A wireless device comprising: a notification unit that notifies information indicating the reception quality to a communication device that is a transmission source of the signal. A wireless device having an antenna with a variable beam width,
A receiving unit that receives information indicating the beam width of the antenna determined in a communication device that is a communication partner; and an antenna control unit that uses the received beam width of the antenna as the beam width of the antenna of the own device. A wireless device. A wireless device having an antenna with a variable beam width,
A reception unit that receives information indicating the reception quality of the transmitted signal from a communication device that is a communication partner;
An antenna beam width determining unit for determining a beam width of the antenna corresponding to the reception quality;
An antenna control unit configured to set a beam width of the antenna to the beam width determined by the antenna beam width determination unit.   6. The reception quality and the beam width of the antenna are associated with each other such that the higher the reception quality, the wider the beam width of the antenna. The wireless device according to item.

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